potter



Feb. 22 1927.

F. D. POTTER COMBUSTION CONTROL APPARATUS 2 Sheet s-She'et 1 Filed Dec. 20, 1918 lNbENTOl? 37mm 05 0M;

A TTORNE Y l, l 4 1927' F. D. POTTER 6 847 COMBUSTION CONTROL APPARATUS Filed Dec 20, 1918 2 sheets-sheet 2 L E F l/wavrok fwd/6 19%.,

Patented Feb. 22, T9237. I

UNETE ATENT eases.

FREDERICK D. EOT'IER, OF LINDEN, NEWJERSEY, ASSIG NQB TO CUMBUSTION CON- rnor. oorrrnnr, rim,

or new YORK, n. Y.

COMBUSTION-CONTROL APPARATUS.

Application filedDeceinber 20, 1918. Serial No. 267,631.

My invention relates to apparatus for securing combustion control and is an 1mpro-vement upon my Patent No. 1,246,656, granted on the 13th day of November, 1917.

In my said patent I have disclosed means for indicating changing temperature conditions of furnaces for boilers and the like, making use of a small short circuit passage through the bridge wall, for example, associated with means for indicating temperature changes of gases, etc. passing-therethrough.

Such control means in accordance with my said patent give an etlective indication of conditions within the combustion chamher, and enable any undesirable conditions in the combustion chamber. such as a hole in the fire bed or the like, to be quickly detected and remedied.

While the maintenance ofa good fire is one essential to economical utilization of' coal for heat production, it is not the only essential. For example. even when a good fire is maintained the furnace gases may pass out through the stack without the substantial reduction of temperature which takes place under good working conditions, and much heat is lost up the stack by reason of the boiler tubes being dirty or the boiler being coated with scale, etc.. etc.

More or less check on such conditions can be obtained by means of a temperature indicator giving the temperature of the outgoing gases, but such an indicatorby itself affords no reliable information. as manifestly its variations will depend on varia tions in furnace conditions, as well as on variation in amount of heat being delivered to the boiler or other heat utilizing device.

According tothe present invention I combine an indicator of furnace conditions. preferably embodying the invention of my said patent, with means for indicating the temperature of the gases after they have done all or part of their work. as. for example, heating a boiler. Such indicators are preferably of the recording type and means are preferably provided for making the records on a single record sheet. whereby records are obtained side by side showing approximately the furnace temperatures and the temperatures of the outwardly traveling gases. The diiferences between these at any given time show the temperature re duction due to the performance of useful work, and in this way accurate information drawing, Figure 1 is a perspective view of a boiler in its setting and with parts broken away to show interior construction. Figure l 2 is a crosssectional view through the bridge wall. Figure 3 is a cross-sectional view at right angles to Figure 2, andFigure 4 is a longitudinal view of a boiler setting partly in section.

The boiler illustrated is of the Babcock gases and products of combustion always pass through such opening when the boiler is being fired, by reason of differences in pressure, etc. on the opposite sides of the bridge wall. Temperature sensitive means are associatedwiththe passage 14;. as. for example, two thermo-couples 16 and 17 extend from the end of the bridge wall to the passage 14, through which gases from the furnace are passed. One of these thermocouples 16. as shown. is wired to the indicating pyrometer 18 placed in a convenient position for observation by the fireman, as on the boiler front. This. however. is not separately claimed herein, being one embodiment of the invention of my said patent. One feature of the present invention consists in providing the recess 15 within the wall of the hollow tile 15 where the heads of the thermo-c'ouples are placed. In this way. while the temperature of the gases may be obtained satisfactorily. the heads of the thermo-coupl'es are not directly exposed to the flames so as to be impaired. and collection of dust, ashes, etc. about the heads of the thermo-couples is eliminated.

Thermo-couples are also placed in positions to take the temperature of the gases after they have done their work of heating,

"or pa-rts- 'thereof. In the form shown in Figure-lone such thermocouple 19 is placed in the base of the stack 12. Both the thermo couples l'i'i and 19 are connected with tem-- perature indicating means, which is preterably also a recording means. In the form shown they are connected to a recording Lpyrometer 20 and both records made side by desired,* as, for example, in theengineens oiliceyand, ailords a'ready means all times of directly observing the approximate temperature of the fire box, and otout-going gases, together with the difference between these,"which affords a good index of the efli'cie'noy with which the heat generated is being utilized.

Where additional and more complete information is desired, additional"thermo-coue ples may be located in the. gas passages; In the form'show'n in Figure l, "for example, themo-couples 20 and 21, are placed within the passages traveled by the gasesbetween the fire box and stacln one such thermo-couple 20 being placed substantially above the front baille'22', over which the gases must pass, and the second thermo-couple 21 being placed beneath the rear baille 23, below which the/furnace gases must likewise pass. It will, of course,.be understood that such arrangement is merely illustrative of one type of arrangement for a particular type of boiler and setting, and that other arrange-V ments are used with'other types of boilers a'nd'settings, and that the number of therinO-cOuple-S used-may be more or less than as shown.

All four of the thermo-couples 17, 20, 21 and 19" are shownin Figure 4: as connected up to a recording pyrometer 2d, and their record lines are shown at 25, 26, 27 and 28, respectively. I

" It'will be understood that the line 25 cor-- responding to the thermocouple 17 serves substantially as a base line and that ordinarily variations in the other record lines will followvariations in the base linc'25, at least'm a general way, and by comparing and takingthe differences indicated between the base curve and any other of the remaining'curves, or between two ormore of such curves, substantially complete information of? what is going on and how the heat produced is being utilized in the parts'of the boiler setting may be' obtained'.

It is to beunderstood that modifications and changes from the-form shown for'illustration may be resorted to within the scope, oi my claims, and that, among other things, where the recording pyrometer has a lesser number of recording pens than/the number of thermoflouples supplied, it will'be understood, of course, that switches are arranged for taking the recordsott the-various thermocouples desired. It will also be understood that the invention here shown in connection wit-h a single boiler gunit may be utilized with larger batteries-of "boilers by provision of proper switches, connecting wires, etc, which will be readily imderstood and do not require illustration, and that-it is not confined in its application to boilers, but may be made use of in various otlierforms otdevicesin which heat-is generated and utilized. i

I claim:

In combination, a combustion chamber, a heat utilizing device such as aboiler, for

example, providedwith a passagetrave-led V flame inthe con bustionchamber, means for taking temperatures of the gases of said passage at a region remote from thecombus ti on cl'ia'mber and after they have given up heat for utilization, and refractory covered thern'io-couple temperature taking means passing through said conduit, whereby'upon comparing the ten'iperatures-olf gases passing through said conduit, plus the necessary diiterential to convert same to combustion chamber temperatures, with the temperatures taken in the remote portion ofthe gas passage, the extent to=which heat is given up to the heat utilizing device betweeir'the combustion chamber and said'remote region of said passage maybe substantially detcrmine d i i in testimony that Iclaim-the foregoing, I have hereto set my hand, thisl8th d'aytot Decen'iber, 1918.

FREDERICK D PQTTER;

for taking the temperature o f the gases 7 

